alkenes and alcohols(p2)

Question 1

how do you form an alkene?

Answer 1

Halogen elimination from a halogenoalkanes

Question 2

draw the elimination reaction from ethanol to ethene?

Question 3

what are the 4 conditions to hydrating an alkene to an alcohol?

Answer 3

-steam
-acid catalyst
-300c
-pressure:60atm

Question 4

what is the equation for the fermentation of glucose

Answer 4

C6H12O6=C2H5OH+CO2

Question 5

give 3 advantages and 2 disadvantages of using fermentation over hydrating an alkene

Answer 5

advan
- use of sugars=renewable
- batch process, so cheap equipment cost
- carbon-neutral
disadvant
- slow reaction
-impure product, need further processing

Question 6

to create cyclohexene from cyclohexanol what is needed to be added?( alkene to an alcohol)

Answer 6

concentrated phosphoric acid and sulfuric acid, bumping granules

Question 7

why is it important during distillation for it to be a closed system?

Question 8

describe the separation stage

Answer 8

1. transfer to separating funnel
   2.add water to dissolve soluble impurities
2. allow to sep, drain off aqueous layer

Question 9

what is added during purification to ensure all water is gone?why

Answer 9

anhydrous calcium chloride-removes any traces of water

Question 10

what is the photosynthesis equation?

Answer 10

6CO2+ 6H2O= C6H12O6+ 6O2

Question 11

what is the combustion of ethanol equation?

Answer 11

2C2H5OH+6O2–>4CO2+6H2O

Question 12

why is the creation of biofuels considered as carbon neutral?

Answer 12

the amount of CO2 taken in by creating ethanol is the same amount given out when burning

Question 13

Draw the mechanism for the formation of an alcohol from an alkene during a hydration reaction